fin and the pectoral finSj and gave it the name T^ ectenes or the slender 

 spearfisho It is thought that these two species are probably one and 

 the same^ howeverp they appear to differ in a numbs/ of characters and 

 therefore, pending future investigation^ they are he-f recorded as 

 separate species,, Furthermore^ it is thought that Jordan and Bvermann's 

 assignment of the species to the genus Tetrapturus should obviously be 

 corrected^ 



Subf ami ly Marlinae 



The body is elongated but conspicuously stoutp and the body depth 

 is generally greato The greatest height of the first dorsal fin is 

 less than the body depths and the height of the fin gradually decreases 

 posteriorlyo The ventral fins are shorter than the pectoral fins. 

 Vertical stripes may or may not be present on the sides of the bodyo 

 The vertebral count is 11 / 13 s 24. 



The species of this subfamily show marked differences in size by 

 sex, the males generally being smaller than the females. Furthermore, 

 the sexes differ with regard to the season at which they migrate into 

 various areas, and consequently, the sizes of fish which are taken at 

 different seasons vary remarkablyo HithertOj the species of this sub- 

 family have been lumped together with those of Kajikia in the genus 

 Makaira p bat because of their marked morphological differences, they 

 have been separated and set up as a new subfamily,, 



Key to the Genera 



lo The pectoral fin fonns a right angle with the side of the 



body, and cannot be folded against the body without breaking 

 the jointo No vertical stripes on the side of the bodyo A 

 simple lateral linoo The air bladder is foam-like, with 

 several layers of small chambers, the whole enclosed within 

 a thick membrane ,...o.oo..oooo<,ooo<,ooo<.oooo Genu s Marlina 



2„ The pectoral fins can be readily folded back against the 



side of the bodyo Vertical stripes are present on the sides 

 of the bodyo The lateral line is complexo The small 

 chambers of the air bladder are generally arranged in a 

 single layer, and the membrane which covers its outside 

 is not particularly well developed o.oo <>....• Genus Bumakaira 



Genus Marlina Nakamura 



The pectoral fins form roughly a right angle with the sides of 

 the body, and cannot be folded back against the sides of the body 

 without destroying their jointso The construction of the air bladder 

 is peculiar, being a bubble-like mass of small chambers arranged in 

 several layers, the outside of the whole mass being enclosed in a thick 

 membrane. The lateral line is singleo There are no vertical stripes 

 on the sides of the bodyo The following single species occurs in 

 Japanese waters o 



62 



